Lecture Summary: Kieran Timberlake have used the rainscreen principle and back ventilation strategies as points of departure for performance-based design that produces striking and distinctive masonry buildings. Architect Chris Macneal will talk about how wall cladding assemblies address issues of differential movement, water penetration and thermal insulation, and how a formal aesthetic for buildings can emerge from the these performance considerations. Residence hall projects for Cornell, Yale and University of North Carolina, plus other campus building types from current and recent Kieran Timberlake projects will be used as examples.